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Development of an apoptosis endonuclease assay
1Department of Poultry Science, University of Georgia, Athens 30602.
DNA and Cell Biology
|March 1, 1991
Summary
Researchers developed an assay to study internucleosomal DNA degradation during apoptosis. This assay helps identify nucleases involved in programmed cell death by measuring DNA fragmentation.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Programmed cell death, or apoptosis, is characterized by DNA fragmentation.
- Specific nucleases cleave genomic DNA at internucleosomal sites during apoptosis.
- Understanding these nucleases is crucial for studying cell death mechanisms.
Purpose of the Study:
- To develop and validate an assay system for measuring internucleosomal DNA degradation.
- To characterize the enzymatic activity responsible for DNA fragmentation during apoptosis.
- To facilitate the isolation and identification of apoptosis-associated nucleases.
Main Methods:
- An assay was developed to measure internucleosomal DNA degradation.
- Micrococcal nuclease (MNase) was used to validate the assay.
- Chicken thymocyte nuclear proteins were incubated with chicken red blood cell nuclei, followed by DNA extraction and gel electrophoresis.
Main Results:
- The assay demonstrated ATP-dependent, time- and protein concentration-dependent internucleosomal DNA degradation.
- The activity was inhibited by EDTA, EGTA, alkylating agents, and heat denaturation.
- Specificity was confirmed as other enzymes failed to produce discrete DNA fragments.
Conclusions:
- The developed assay system effectively measures internucleosomal DNA degradation.
- This assay is instrumental for isolating and characterizing nucleases involved in apoptosis.
- The findings provide a foundation for further research into the molecular mechanisms of programmed cell death.